Fix spelling: change "ack'd" to "acked" for consistency

[Copilot]

Fix spelling: change "ack'd" to "acked"

Description

Addresses feedback from PR #148 code review. Changes the abbreviation "ack'd" to "acked" for consistency with standard spelling conventions in technical documentation.

• ModeManager.fpp:181 - Event format string
• docs/sdd.md:476 - Documentation table

Related Issues/Tickets

• Addresses feedback from Hibernation Mode #148: Hibernation Mode #148 (comment)

How Has This Been Tested?

Documentation-only change (spelling fix in format strings and markdown).

• Unit tests
• Integration tests
• Z Tests
• Manual testing (describe steps)

Screenshots / Recordings (if applicable)

N/A - text-only change

Checklist

• Written detailed sdd with requirements, channels, ports, commands, telemetry defined and correctly formatted and spelled
• Have written relevant integration tests and have documented them in the sdd
• Have done a code review with
• Have tested this PR on every supported board with correct board definitions

Further Notes / Considerations

Trivial spelling fix. No functional changes.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)